/Engine/Source/Runtime/Engine/Classes/Animation/BlendSpace.h
Get Grid Samples from BlendInput, From Input, it will populate OutGridSamples with the closest grid points.
void GetRawSamplesFromBlendInput ( const FVector & BlendInput, [TArray](API\Runtime\Core\Containers\TArray)< [FGridBlendSample](API\Runtime\Engine\Animation\FGridBlendSample), TInlineAllocator< 4 > > & OutBlendSamples ) const